The LED is where the 3D printer projects UV light through the LCD and cures the resin. The LED may need to be replaced after some time. In the following article, we have divided the post into 2 parts: removing the old LED and installing the new LED.
This article uses Sonic Mini 4K as an example. If you're using another printer, you can still use this as a reference.
Part 1: Removing the Old LED:
Step 1: Remove the plastic cover, the vat, and the building plate.
Step 2: Make sure the building plate on the Z-axis is retracted completely. If it isn’t, click TOOLS, and then click MANUAL, click on 10mm several times.
Step 3: Turn off the 3D printer and unplug the power cable.
Step 4: Flip the 3D printer and remove the printer’s bottom with an m3 Allen wrench which is included in the toolbox.
Step 5: Remove the ➊ LED cable from the mainboard.
Step 6: Use an m2.5 Allen wrench and turn counter-clockwise to loosen the screws holding the LED lens and the LED light guide beneath it.
Step 7: Then remove the LED board from the metal plate.
Please DO NOT remove the linear guide from the rail as it may cause great damage to the Z-rod.
Part 2: Installing the new LED:
Step 8: Place the LED board in place and tighten the screws holding the LED board.
Step 9: Reattach the LED light guide and the LED Lens.
Step 10: Reconnect the LED cable to the mainboard.
Step 11: Place the bottom back onto the 3D printer and tighten the screws.
Step 12: Turn the LCD 3D printer upright. Plug in the power cable, and turn on the 3D printer.
Step 13: Perform the LCD test to ensure that the LCD screen is functioning properly.